Taking a word that means literally "nothing" and using it to mean the opposite ie: many, plenty, alot.

The lack of anything

You don’t need a girl, and your not desperately in need of one. so basically your in noneed of a girl, because your life is good the way it is.

When an authority figure yells at an idiot, instead of saying, "Don't do that."

Ebonics for NOTHING.

Half a penis

To stare (pyscho stalker stare) at someone with your mouth wide open like you are catching flies non stop.